花生壳活性炭对水溶液中活性艳兰染料的吸附(2)

 

式中:R为气体常数,丁为绝对温度,K为热力学常数.

根据不同温度下的吸附实验结果,计算相应的热力学参数值见表3.吉布斯自由能是判断吸附过程能否自发进行的基本条件,由表3可以看出,花生壳活性炭吸附活性艳蓝的吉布斯自由能AG<0,说明花生壳活性炭对活性艳蓝的吸附过程可自发进行;AH>0,说明该吸附过程是吸热的,升高温度有利于吸附;AH绝对值在2.1—

20.9

kJ/mol,吸附机理表现为物理吸附;△S>0,说明该吸附反应是熵值增加的过程.

万方数据


第11期王丽敏,等:花生壳活性炭对水溶液中活性艳兰染料的吸附

103

艳蓝的吸附动力学行为,相关系数超过0.99.(3)花生壳活性炭对活性艳蓝的吸附等温线符合Freundlich模型;吸附的热力学行为表明,该吸附可以自发进行,吸附过程是吸热的,吸附作用主要表现为物理吸附;吸附反应是熵值增加的过程.

ment

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81J

KhaledA.,AhmedE.N.,AmanyE.S.,eta1.Treat.

AdsorptionofReactiveBrilliantBluefromAqueousSolution

byPeanutHullActivatedCarbon

WANG

(College

Li-min,ZHANGYong-qian

132022,China)

ofResourceandEnvironmentEnglneefing,JilinInstituteofChemicalTechnology,JilinCity

Abstract:Activatedcarbonpreparedfrompeanuthullusingphosphateadsorbent

to

asan

activator

at

400℃wasutilized

to

as

removereactivebrilliantbluefromaqueoussolution.Batchexperimentswereconducted

on

study

theeffectsofpH,adsorptiontime。andinitialconcentrationofadsorbatereactive

reactive

brilliant

blueadsorption.

Theresultsshowthattheadsorptionequilibriumofpeanuthullactivatedcarbonreachedwithin90minfor

brilliant

blueconcentrations

of100mg/L.The

equilibriumdatain

aqueous

solutionswerewell

representedbytheFreundlich

models.Themg/g.ne

pseudo—secondorderequationprovidedthebettercorrelationofthe

usedexperimentaldata.Theadsorptioncapacityofreactivefound

to

be

as

high

as

482.8

thermodynamic

brilliantblueontopeanuthullactivatedcarbonconstantsoftheadsorptionprocessAH.AGandAS

on

wereevaluated.These

showthatadsorptionofreactivebrilliantbluepeanut

as

hullactivatedcarbonwas

spontaneous.Thepeanuthullactivated

carbon

wasfoundtobeveryeffectiveadsorbentforreactivebrilliant

bluefromaqueoussolution.

Keywords:peanuthullactivatedcarbon;adsorption;reactive

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